What is a solid-state relay (SSRs) / solid state contactor (SSCs)?

A solid-state relay (SSR) or solid-state contactor (SSC) is an electronic component that switches power (AC or DC current) to a load circuit and provides electrical isolation between an application’s control circuit and load circuit. It is a competitive technology to electromechanical relays (EMRs) and other switching technologies such as mercury displacement relays (MDRs).

Why use solid state switching technology?
  • Long service life
  • Quiet operation
  • Minimum electrical noise
  • Low power consumption
  • Shock & vibration resistant
  • Ideal for harsh environments
  • High compatibility with control systems
  • Reduced weight
  • Position insensitive
  • Fast switching
  • Magnetic noise immunity
  • Reduce energy cost
Solid state relays & solid-state contactors applications

Although there are literally thousands of individual uses for solid state relays and solid-state contactors, most can be categorized into the following applications:


Heating control application

This encompasses the largest segment of solid-state relay users.


Applications include, but are not limited to: professional food equipment, plastic molding/extrusion machinery, heating ventilation air conditioning & refrigeration (HVAC&R) and soldering equipment.


Benefits include: Long life, no maintenance, safe product, easy to interface, as well as enabling temperature accuracy. Suitable for heaters, fans, blowers and valve control.


Motion control applications

Applications include, but are not limited to: elevators, lifts, hoists, exercise equipment, conveyor
systems, solar trackers, fans, solenoids and valve control.


Benefits include: Endurance, shock & vibration resistance, soft start, reversing, no arcing, fast switching, long life, no maintenance, easy to interface, reduced parts count.

Power control applications
 
Power applications cover switching of power supplies, transformers, regulators, inverters, converters, UPS systems, etc.


Benefits include: Easy to interface, no arcing, immune to magnetic noise, automated switching,
low electrical noise, no maintenance, shock and vibration resistant.

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